Grinding-machine.



No. 769,207. PATENTED SEPT. 6, 1904. J.P.BUGKLEY.

GRINDING MACHINE.

APPLICATION FILED APB:.18, 1903.

' no MODEL. I v 1 2 sums-sum 1.

600" ea I r PATENTED SEPT. s, 1904.

J.F.BUGKLEY. GRINDING MACHINE.

APPLICATION FILED APR. 18, 1903.

2 SHEBTSSHEET '2.

N0 MODEL.

I UNITED STATES Patented September 6, 1904. i

PATENT OFFICE.

JAMES FRANCIS BUOKLEY, DARTFORD, ENGLAND, ASSIGNOR TO ALLEN AND HANBURYS, LIMITED, OF LONDON. ENGLAND.

GRINDING-MACHINE.

SPECIFICATION forming part of Letters Patent N 0. 769,207, dated September 6, 1904.

Application filed April 18, 1903.

To all whom it may concern.-

Be it known that I, J AMES ERANcIs BUGKLEY,

a subject of the King of Great Britain, and a of the upper or working part of resident of 27 Highfield road, Dartford, in the county of Kent, England, have invented certain new and useful Improvements in Grinding-Machines, of which specification.

The main object of the present invention is to provide simple and efficient means for grinding and polishing the concave faces of punches used in compressing-machines for making medicinal tablets.

In the accompanying drawings 1 have shown a machine embodying my invention.

Figure 1 is a side elevation. Fig. 2 is a plan view of the machine complete; and Fig. 3 is a sectional elevation, on an enlarged scale, the machine only.

The machine which I have chosen to illustrate my invention is a power-driven machine comprising a framing a, supporting in suitable bearings a driving-shaft b, carrying fast and loose pulleys'cZ e and two grooved pulleys f and g for driving the machine, the former of which is much larger than the latter. The machine proper is mounted on a bed-plate it, supported on the framing a. Upon the bedplate it is a head-stock 2', and within the headstock is a sleeve carrying a grooved pulley 70. Rotation may be imparted to the pulley 7s and sleeve j bymeans of the band Z, running over the pulley g on the shaft 6.

Within the sleeve is a spindle m, which is free to slide endwise in the sleeve, but must rotate therewith by reason of the keyway n (see Fig. 3) and a corresponding key in the sleeve to engage therewith. One end of the spindle m carries a chuck 0 of any suitable kind for holding the punch p or other tool to be ground. The other end of the spindle m is reduced in diameter and is embraced by a snugly-fitting collar 9, which lies comfortably between the shoulder r and the nut s, so as not to impede the rotation of the spindle. The endwise movement of the spindle m in the sleeve to advance the punch up to the grinding-surface is effected by the collar 9,

the following is a tent.

Serial No. 153,191. (No model) which is preferably controlled by a lever t, fulcrumed at a and having a pivotal connection with the collar g, as shown in Fig. 3.

U isan adjustable stop for the lever t, by means of which the endwise movement of the spindle m and the punch 19 in a forward direction is limited to any desired extent.

w is the grinding-wheeler other deviceused for grinding or polishing the punch. This wheel is attached firmly to its spindle m, which is mounted in suitable bearings in the headstock 3/. The spindle a2 receives its motion by a band 2, passing over driving-pulley Z, attached to the spindle a1, and the large drivingpulley f onthe driving-shaft 6, before mentioned, these pulleys being placed in the same vertical plane. The pulley 7c of the. punchcarryingspindle being arranged at right angles to that on the driving-shaft of the machine, the band connecting them has to be twisted.

The cutter or polishing device may be an ordinary emery-wheel, or it may be a softsteel ball charged with diamond-dust, the latter being preferable for grinding deep-sunk punches.

The machine may, if desired, be employed for other forms of internal grinding by changing the position of the grinding-head with regard to the sliding spindle. In operating the machine the punch or other article to be ground having been fitted to the supporting spindle, the latter is advanced against the grinding-wheel. This wheel, as will be understood from the foregoing description, is rotated at a fast rate of speed, while the article being ground is turned more slowly, owing to the smaller size of driving-shaft. The advance of the punch is continued by means of the hand-lever 2? until the latteris arrested in its movement by the stop '0, previously adjusted to the proper ex- In this way a number of punches may be ground.so as to be identical inevery respect. It may be remarked that this machinewill suffice to grind or repair the damaged faces of the punches without necessitating the softening of the latter. It is the usual custom at present when repairsv are required to soften the pulley on the the punches and turn them out in a lathe, after which they are retempered. The softening of the punches is generally effected by heating them, which not only occupies time, but also when constantly done renders them liable to deteriorate as regards the quality of the steel, and hence the advantage of a device which obviates the softening altogether.

The driving-shaft is preferably placed below the bed, so as to avoid the employment of overhead shafting.

What I claim as my invention, and desire to secure by Letters Patent, is-

In a machine for grinding punches, the combination of a framing and a bed-plate thereon, a chuck-carrying spindle and a grinding-spindle arranged at an angle to each other above said bed-plate, a bearing on the bed-plate for the grinding-spindle, asleeve surrounding the chuck-carrying spindle and fitted to said spin- 20 the bed-plate, a pulley on said grinding-spindle and one on said sleeve, two pulleys on said driving-shaft, and two belts between the latter pulleys and the two spindle-pulleys for giving rotary motion to the two spindles.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JAMES FRANCIS BUCKLEY.

Witnesses:

ALFRED S. Blsuor, A. Comm. 

